How to read the band →
Solid line = floor (spellings that unambiguously belong to the group). Shaded band up to the dashed edge = ceiling (the most it could reach if every ambiguous spelling counted here).
Lucas
Lucas climbed for decades and has been a steadily popular name ever since. All-time it's been given to 375,700 U.S. babies, the 14th most common name by sound today, peaking at 14,787 in 2017, with 11,389 in 2025.
By sound, Lucas also includes the spellings Lukas.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).